<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" type="text/css" href="7.css">
    <style>
        h1 {
            color: blue !important;
            background-color: black;
        }
    </style>
</head>
<body>
<h1 style="color: red">这是文字</h1>
</body>
</html>